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Finding the Fourth Proportional to 11,439.72, 15,783.31 and 7,656.89

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Solution

The fourth proportional to 11,439.72, 15,783.31 and 7,656.89 is: 10,564.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,439.72 : 15,783.31 = 7,656.89 : x
  2. Step 2: Convert to fraction form
    11,439.72/15,783.31 = 7,656.89/x
  3. Step 3: Cross multiply
    11,439.72x = 15,783.31 × 7,656.89
  4. Step 4: Simplify right side
    11,439.72x = 120,851,067.07
  5. Step 5: Solve for x
    x = 120,851,067.07/11,439.72
  6. Step 6: Final answer
    x = 10,564.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.